Supplemental PRS Transmission for Sidelink Positioning Accuracy
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Solution Overview
Problem
Current wireless communication systems face limitations in sidelink positioning accuracy due to restricted bandwidth and quantity of positioning reference signals (PRSs), which affects the precision of determining the geographic location of user equipment (UEs) in sidelink communications.
Innovation Solution
A method where a first UE transmits PRSs in an unshared radio frequency spectrum and supplemental PRSs in a shared spectrum, allowing the second UE to use both sets for improved positioning measurements, with configuration messages managing the transmission parameters such as frequency location, bandwidth, and phase continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PRS transmission is limited to unshared spectrum only, then spectrum access is guaranteed, but positioning measurement accuracy is insufficient
Solution Approach 1:
The patent divides PRS transmission into two separate spectrum domains: unshared spectrum for guaranteed access and shared spectrum for enhanced accuracy. This segmentation allows the system to leverage the reliability of unshared spectrum while incorporating the additional measurement opportunities from shared spectrum, thereby resolving the contradiction between measurement precision and spectrum utilization flexibility.
Solution Approach 2:
The patent extends the traditional single-spectrum PRS transmission by adding a second spectral dimension (shared spectrum). This dimensional expansion provides additional frequency resources for positioning measurements, enabling the system to achieve higher accuracy without compromising the guaranteed access provided by unshared spectrum transmission.
2Measurement precision
If supplemental PRSs are transmitted in shared spectrum, then positioning accuracy is improved, but channel access complexity increases
Solution Approach 1:
The patent implements preliminary configuration of supplemental PRS parameters (frequency location, bandwidth, time resources) through RRC signaling before actual transmission. This advance configuration allows the UE to prepare for shared spectrum transmission in advance, reducing the real-time decision complexity and streamlining the channel access procedure while maintaining improved positioning accuracy.
3Measurement precision
If both unshared and shared spectrum PRSs are used, then positioning accuracy is enhanced, but signal processing complexity increases
Solution Approach 1:
The patent enables the receiving UE to selectively process PRS signals based on availability and quality. The UE can use only unshared spectrum PRSs when shared spectrum signals are unavailable or degraded, and incorporate shared spectrum PRSs when they provide additional measurement value. This partial action approach enhances accuracy when possible while avoiding unnecessary processing complexity when shared spectrum resources are not beneficial.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may be configured to transmit positioning reference signals (PRSs) to a second UE in an unshared radio frequency spectrum and transmit supplemental PRSs to the second UE in a shared spectrum. The second UE may then use the supplemental PRSs in addition to the PRSs in the unshared spectrum to compute a position of the first UE. In some cases, the first UE may signal a configuration for the supplemental PRSs to the second UE, and, in other cases, a base station may signal the configuration for the supplemental PRSs to the second UE. In any case, because the second UE may use both the PRSs in the unshared spectrum and the supplemental PRSs to compute the position of the first UE, the accuracy of the computed position of the first UE may be improved.